Web Forms :: Error In Web Form / Using A Custom User Control Which Is Compiled Into A Single Assembly
Apr 23, 2010
I am having a very hard time in consuming a very simple web user control that I have built using a Web Application project in VS 2010. The user control works fine as long as the consuming aspx page is in the same project. But after deploying the project using Web Deployment Project into a single assembly I am not able to use it correctly from another aspx page which is in a stand-alone project. The error I see is a null reference exception. Here are the steps that I am following:
1 Create a web user control named WebUserControl_Label using a web application project. This control works fine when used in an webform in the same project.
This is the ASCX of my user control :
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl_Label.ascx.cs" Inherits="TestWebAppWithCustomControl.WebUserControl_Label" ClassName="TestWebAppWithCustomControl.Controls" %>
<asp:Label ID="Label1" runat="server" ></asp:Label>
This is the code behind:
namespace TestWebAppWithCustomControl
{
public partial class WebUserControl_Label : System.Web.UI.UserControl
{
private string _labelText;
public string LabelText
{
set
{
Label1.Text = value;
}
get
{
return Label1.Text;
}
}
protected void Page_Load(object sender, EventArgs e)
{
}
}
}
2. Create a single assembly for the user control above using a Web Deployment project. The name of the assemby is TestWebAppWithCustomControl.
3. Create a webform in another web application project to use WebUserControl_Label user control. This project has TestWebAppWithCustomControl.dll added as a referemce.
This is how I am using the custom control above in an aspx page:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ConsumeTestWebAppUserControl._Default" %>
<%@ Register Assembly="TestWebAppWithCustomControl" Namespace="TestWebAppWithCustomControl" TagPrefix="GBS" %>
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<GBS:WebUserControl_Label Id="label1" runat="server" LabelText="This is custom label" />
</div>
</form>
</body>
</html>
The problem is that .NET throws a Null Reference Exception when its trying to set the label text via the LabelText property. It looks like that the label control that lives inside the WebUserControl_Label user control is not getting instantiated and is always null.
I have found a few articles online that talk about creating such distributable user controls using ASP.NET website projects. But if possible I would like to stick with the web application project because of the benefits it brings.
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